Rectifier bridge circuit and power supply method and device for rectifier bridge circuit

Abstract

The present invention discloses a rectifier bridge circuit and a power supply method and device for the rectifier bridge circuit. The rectifier bridge circuit comprises: a plurality of power supply line pairs, wherein the plurality of power supply line pairs are connected to respective corresponding control circuits, wherein the control circuit is used to control the power supply state of the power supply circuit corresponding to the corresponding power supply line pair; and a bridge arm is provided in the control circuit. The present invention solves the technical problem that the current rectifier bridge circuit cannot be powered on due to the control circuit coupling of the power supply line pair.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a rectifier bridge circuit and a power supply method and device for the rectifier bridge circuit. Background Art

[0002] PoE (Power over Ethernet) refers to a technology that transmits power through network cables. With the increasing popularity of IP phones, network video surveillance, and wireless Ethernet devices in the network, the demand for power support through Ethernet itself is becoming more and more urgent. As the functions of load devices are enhanced, the power consumption of load devices is also increasing. At present, the IEEE 802.3bt protocol increases the upper limit of POE power supply to 90W, which poses a great challenge to the current rectifier bridge solution in terms of efficiency and heat dissipation.

[0003] In the related technology, PoE rectifier bridge solutions mainly include two categories: diode rectifier bridge and MOS tube rectifier bridge. The diode rectifier bridge is widely used due to its simple structure. However, in high-power power supply scenarios, the high forward voltage drop of the diode (about 0.7-1V) causes significant losses during the rectification process, which in turn causes the rectifier bridge to overheat, which not only affects the system efficiency, but also may pose risks to the long-term operation of the equipment. Compared with the diode rectifier bridge, the MOS tube rectifier bridge has a lower on-resistance, so the loss generated during the rectification process is smaller and the heat dissipation pressure is relatively small. However, the MOS tube is a bidirectional conducting device, and the control loop in the MOS tube rectifier bridge is not independently decoupled. Under different working conditions (such as the power-on sequence of the power supply line pair), there will be mutual influence and coupling, resulting in unexpected conduction of the MOS tube, failure to achieve rectification as expected, and then resulting in probabilistic failure to power on the subsequent equipment, resulting in compatibility issues between PSE devices, affecting the reliability of PoE system power-on, and reducing user experience. Especially in the high-power power supply mode of the IEEE 802.3bt protocol, this compatibility issue is more prominent, which may cause the device to fail to power on normally or reduce the probability of powering on.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a rectifier bridge circuit and a power supply method and device for the rectifier bridge circuit, so as to at least solve the technical problem that the rectifier bridge circuit cannot be powered on due to the control loop coupling of the power supply line pair.

[0006] According to one aspect of an embodiment of the present invention, a rectifier bridge circuit is provided, comprising: a plurality of power supply line pairs, wherein the plurality of power supply line pairs are connected to respective corresponding control circuits, wherein the control circuits are used to control the power supply status of the power supply circuits corresponding to the corresponding power supply line pairs; and a bridge arm is provided in the control circuit.

[0007] Optionally, the structure of the bridge arm includes at least one of the following: a resistor and a control switch.

[0008] Optionally, each of the multiple power line pairs corresponds to one or more control loops.

[0009] Optionally, any one of the multiple groups of power line pairs includes a first power line and a second power line, and the control circuits corresponding to each of the multiple groups of power line pairs include a first control circuit and a second control circuit, wherein the first control circuit is used to control the corresponding power line pair to supply power when a forward current is input to the first power line; and the second control circuit is used to control the corresponding power line pair to supply power when a forward current is input to the second power line.

[0010] Optionally, the first control loop and the second control loop share a bridge arm.

[0011] Optionally, the first control loop and the second control loop each correspond to a bridge arm.

[0012] According to another aspect of the present invention, a power supply method is provided for supplying power to a powered device based on the above-mentioned rectifier bridge circuit, comprising: detecting the powered device based on the power supply current input by an external power supply to obtain a detection result; determining the power supply power of the powered device based on the detection result; and controlling multiple groups of power supply line pairs to supply power to the powered device based on the relationship between the power supply power and a preset power threshold.

[0013] Optionally, when the power supply power is higher than a preset power threshold, multiple groups of power line pairs are controlled to supply power to the powered device, including: obtaining the power supply sequence of the multiple groups of power line pairs; based on the power supply sequence, controlling the power supply circuits corresponding to the multiple groups of power line pairs in turn to be turned on to supply power to the powered device; or, based on the power supply current, controlling the power supply circuits corresponding to the multiple groups of power line pairs to be turned on at the same time to supply power to the powered device.

[0014] Optionally, when the power supply power is lower than a preset power threshold, controlling multiple power line pairs to supply power to the powered device includes: controlling any one of the multiple power line pairs to supply power to the powered device.

[0015] According to another aspect of the present invention, there is provided a power supply device, comprising: a detection module, used to detect a powered device based on a power supply current input by an external power supply to obtain a detection result; a determination module, used to determine the power supply power of the powered device based on the detection result; and a power supply module, used to control multiple groups of power supply line pairs to supply power to the powered device based on the relationship between the power supply power and a preset power threshold.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium including a stored executable program, wherein when the executable program runs, the device where the computer-readable storage medium is located is controlled to execute any one of the power supply methods described above.

[0017] According to another aspect of the present invention, there is provided an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein any one of the above-mentioned power supply methods is executed when the program is running.

[0018] According to another aspect of the present invention, a computer program product is provided, comprising a computer program, and when the computer program is executed by a processor, the above power supply method is implemented.

[0019] According to another aspect of the present invention, a PSE power supply device is provided, comprising a power supply and the above-mentioned rectifier bridge circuit. The PSE power supply device applies the rectifier bridge circuit when supplying power to a powered device.

[0020] In an embodiment of the present invention, a rectifier bridge circuit is adopted, through multiple groups of power supply line pairs, wherein the multiple groups of power supply line pairs are connected to their respective corresponding control circuits, wherein the control circuit is used to control the power supply status of the power supply circuits corresponding to the corresponding power supply line pairs; a bridge arm is provided in the control circuit, so as to achieve the purpose of stable and reliable power-on of the rectifier bridge circuit, thereby realizing the technical effect of improving the stability and reliability of the rectifier bridge circuit and enhancing the user experience, and further solving the technical problem of the inability to power on due to the control circuit coupling of the power supply line pairs in the current rectifier bridge circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 is a topological structure diagram of a rectifier bridge circuit according to an embodiment of the present invention;

[0023] Figure 2 is a topological structure diagram of an optional double-arm rectifier bridge circuit according to an embodiment of the present invention;

[0024] Figure 3is a topological structure diagram of an optional double-arm rectifier bridge circuit according to an embodiment of the present invention;

[0025] Figure 4 is a topological structure diagram of an optional four-arm rectifier bridge circuit according to an embodiment of the present invention;

[0026] Figure 5 is a schematic flow chart of a power supply method according to an embodiment of the present invention;

[0027] Figure 6 is a structural block diagram of a power supply device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] First, some nouns or terms that appear in the description of the embodiments of the present application are subject to the following explanations:

[0031] PoE technology, Power over Ethernet, is a technology that can provide power while transmitting data on a standard Ethernet cable, allowing devices to be powered through the existing Ethernet infrastructure without the need for separate power cables;

[0032] IEEE 802.3bt protocol, a standard developed by IEEE (Institute of Electrical and Electronics Engineers), is the latest specification of PoE technology. It is an extension and enhancement of previous PoE standards such as 802.3af and 802.3at, and is designed to support higher power transmission requirements to adapt to the high power consumption characteristics of modern network devices;

[0033] The rectifier bridge circuit is mainly used to unify the DC voltages of different polarities that may correspond to the access line pairs into a DC voltage of a certain polarity. It is composed of four diodes connected in a bridge structure. In situations where high-efficiency or high-power rectification is required, active switching devices such as MOS tubes are used to replace diodes.

[0034] Power line pair refers to the line pair used to transmit power in a standard Ethernet cable. Ethernet cable contains 8 wires organized into 4 pairs, each pair consists of two wires twisted together;

[0035] PSE, Power Sourcing Equipment, is responsible for detecting and providing power to PDs connected to the Ethernet line;

[0036] PD, Powered Device, can be any device that can receive power through an Ethernet cable, such as IP phones, wireless access points, network cameras, etc.

[0037] In the application field of PoE technology, with the enhancement of equipment functions and the increase of power consumption, especially under the IEEE802.3bt protocol, the PoE power supply capacity has reached 90W, which makes PoE technology play an increasingly important role in scenarios such as high-definition video surveillance, high-density wireless LAN coverage, and smart buildings. However, the traditional PoE rectifier bridge solution has exposed some technical bottlenecks in these application scenarios, especially the high loss and heat dissipation problems of the diode rectifier bridge when supplying high power, and the compatibility challenges of the MOS tube rectifier bridge during the power-on process.

[0038] One possible solution is to use higher performance diodes to reduce the voltage drop of the rectifier bridge, but this will increase costs and it is difficult to fundamentally solve the efficiency and heat dissipation problems under high power. Another way is to use the existing MOS tube rectifier bridge solution and add compatibility processing strategies to the design, such as preventing abnormal opening of the MOS tube through control logic, but this may increase the complexity of the control circuit, and compatibility in some extreme cases cannot be fully guaranteed.

[0039] In view of the above problems, a rectifier bridge circuit is provided in the embodiment of the present invention, aiming to solve the problems of efficiency, heat dissipation and compatibility at the same time to meet the needs of high-power PoE power supply. By splitting the power line pairs into multiple groups and connecting them through independent control loops, electrical isolation between the line pairs is achieved, avoiding mutual influence and coupling between the line pairs under different working conditions (such as the power-on sequence of the power line pairs), resulting in unexpected conduction of the MOS tube, failure to achieve rectification as expected, and then resulting in probabilistic failure to power on the subsequent equipment, resulting in compatibility problems between PSE devices. The present invention is not only superior to the traditional diode rectifier bridge in terms of efficiency and heat dissipation, but also solves the compatibility problem of the MOS tube rectifier bridge through the optimization of the control logic, providing strong technical support for the wide application of PoE technology in scenarios such as high-definition video surveillance, smart buildings and high-density wireless LANs.

[0040] According to an embodiment of the present invention, an embodiment of a rectifier bridge circuit is provided. Figure 1 is a topological diagram of a rectifier bridge circuit according to an embodiment of the present invention, such as Figure 1 As shown, the rectifier bridge circuit includes multiple power line pairs, wherein each power line pair is connected to a corresponding control loop, the control loop includes a corresponding bridge arm structure, and the control loop corresponding to each power line pair can also be connected to the PD device through a common wire.

[0041] The plurality of power supply line pairs are all connected to their respective corresponding control circuits, wherein the control circuits are used to control the power supply status of the power supply circuits corresponding to the corresponding power supply line pairs.

[0042] In this optional embodiment, at least two groups of power supply line pairs are used, each group of line pairs consists of two line pairs, and each group of power supply line pairs is connected to an independent control loop. Figure 2 is a topological structure diagram of an optional dual-arm rectifier bridge circuit according to an embodiment of the present invention, such as Figure 2 As shown in the figure, MDI_12, MDI_36, MDI_45, and MDI_78 correspond to the four pairs of network cables 12, 36, 45, and 78 respectively. According to the IEEE 802.3bt protocol, the two pairs of 12 and 36 are a group of power supply pairs, and the positive and negative polarities can be interchanged. The two pairs of 45 and 78 are a group of power supply pairs, and the positive and negative polarities can be interchanged. The control loop is composed of a series of control elements (such as resistors, diodes, etc.) to monitor the voltage state of the power supply line pair and control the conduction or cutoff of the MOS tube in the power supply loop as needed, thereby controlling the flow direction of power and the power supply state. For example, in Figure 2In an optional circuit structure shown, the control loop can be MDI_36-->D2-->ZD2-->R2-->R17-->R5-->ZD5-->D5-->MDI_12, and the power supply loop can be MDI_36-->Q2-->PoE+-->PoE--->Q5-->MDI_12. This independent control mechanism can avoid mutual interference between different line pairs, ensuring that each MOS tube can respond correctly even in a complex power supply sequence, thereby solving the problem of the probability of failure to power on the subsequent device due to unexpected conduction of the MOS tube in the prior art.

[0043] A bridge arm is provided in the control loop.

[0044] In this optional embodiment, unlike the traditional rectifier bridge, the embodiment of the present invention realizes the independence of the power supply line pairs in the control loop design. That is, for different groups of power supply line pairs, each group of line pairs is connected to an independent control loop, so the control loop can respond to the voltage change of its connected line pairs independently without being affected by other line pairs. In each control loop, the bridge arm is the core component, and the bridge arm design in the control loop corresponding to different power supply line pairs can be the same or different. For example, Figure 2 As shown, there is a group of bridges above the resistors R17 and R18, and another group of bridges below them. The two groups of bridges are connected through R17 and R18, so they are called double bridge arms, wherein the resistor R17 is the bridge arm in the control loop corresponding to the group of power supply line pairs 12 and 36, and the resistor R18 is the bridge arm in the control loop corresponding to the group of power supply line pairs 45 and 78. The sizes of the two resistors can be different to meet the control logic requirements of different power supply line pairs.

[0045] As an optional embodiment, the structure of the bridge arm includes at least one of the following: a resistor and a control switch.

[0046] Alternatively, resistors can be used as part of the bridge arm to connect the upper and lower bridges of the circuit, such as Figure 2As shown, resistor R17 and resistor R18 respectively form the bridge arm structure of two groups of power supply line pairs. As a component in the bridge arm, the resistor can provide a stable bias voltage, does not require an additional drive circuit, simplifies the design of the control loop, reduces the complexity and cost of the circuit, and reduces potential failure points, thereby improving the overall stability and reliability of the system. In addition, a control switch can be used as a component of the bridge arm. Using the control switch as the bridge arm structure can achieve active control of the MOS tube. In the power supply stage, the MOS tube can be ensured to be fully turned on to reduce energy loss. In the non-power supply stage, the MOS tube can be turned off to avoid unnecessary current leakage and improve energy utilization efficiency. A combination of a resistor and a control switch can also be used as a component of the bridge arm, while satisfying the effects of simplifying circuit design and improving energy utilization. For example, Figure 3 is a topological structure diagram of an optional dual-arm rectifier bridge circuit according to an embodiment of the present invention, such as Figure 3 As shown, transistors Q17 and Q18 are added to the bridge arm for switching. In the power supply stage, the transistor switches Q17 and Q18 can be turned on to control the corresponding MOS tubes in Q1 to Q8 to be turned on. In the non-power supply stage, the body diodes of the corresponding MOS tubes in Q1 to Q8 are mainly used for freewheeling.

[0047] As an optional embodiment, each of the multiple power line pairs corresponds to one or more control loops.

[0048] Optionally, the power supply line pairs can be divided into at least two groups, and each group of power supply line pairs is connected to one or more independent control loops. Each control loop can include components such as diodes and resistors, and the two ends of each power supply line pair are connected through multiple circuit elements to form a loop. Multiple control loops can share a bridge arm structure as a channel connecting the upper and lower bridges, or they can use independent bridge arm structures respectively. In addition, multiple control loops can also be connected to the positive and negative ports of the powered device through the same wire.

[0049] For example, Figure 2As shown, the MDI_12 and MDI_36 line pairs form the first group and are connected to a control loop, while the MDI_45 and MDI_78 line pairs form the second group and are connected to another independent control loop. This grouping and corresponding method ensures the independent control of each power line pair, avoids the mutual influence and coupling between the lines under different working conditions (such as the power-on sequence of the power line pairs) causing abnormal conduction of the MOS tube, and thus solves the compatibility problem. Compared with the solution of sharing one control loop for all power line pairs, the independent control loop design of the present invention significantly improves the compatibility of the system. Even in the face of different PSE chip and PD device combinations, and in different scenarios of synchronous or follow-up power-on, each group of power line pairs can independently complete the power-on process without being affected by other line pairs, ensuring the stability and reliability of PoE power supply.

[0050] As an optional embodiment, any one of the multiple groups of power line pairs includes a first power line and a second power line, and the control circuits corresponding to the multiple groups of power line pairs include a first control circuit and a second control circuit, wherein the first control circuit is used to control the corresponding power line pair to supply power when a forward current is input to the first power line; and the second control circuit is used to control the corresponding power line pair to supply power when a forward current is input to the second power line.

[0051] Optionally, each group of power supply line pairs includes two line pairs, namely a first power supply line and a second power supply line. Since the positive and negative poles of the powered device are fixed during the PoE power supply process, the current input into the rectifier bridge circuit can only enter from the upper bridge, flow through the powered device, and then flow into the lower bridge. In other words, the same group of power supply line pairs may need to adapt to any situation where the positive pole is in any line pair in actual applications. By designing two independent control loops, the present invention can ensure that no matter how the positive and negative poles of the power supply line pair are configured, the rectifier bridge circuit can be correctly turned on, avoiding problems such as circuit short circuits caused by improper configuration of the positive and negative poles, thereby improving the compatibility and stability of the system. For example, if Figure 2As shown, in the pair of power lines 12 and 36, MDI_12 is the first power line, and MDI_36 is the second power line. The positive and negative polarities of the two can be exchanged. If MDI_12 is connected to the positive pole of the power supply, the first power line inputs a positive current; if MDI_36 is connected to the positive pole of the power supply, the second power line inputs a positive current. During the PoE power supply process, the polarity between the device and the power supply can be uncertain, that is, the first power line and the second power line can interchange the positive and negative polarities. The traditional rectifier bridge circuit cannot adapt to the working conditions of different power-on sequences, and the MOS tube is abnormally turned on, and the rectification power supply cannot be realized as expected, resulting in the probability of power failure of the subsequent equipment, affecting the stability and reliability of the power supply. The present invention effectively overcomes the compatibility problems caused by different power-on sequences by setting an independent first control loop and a second control loop, ensuring that power can be supplied correctly under any polarity configuration.

[0052] As an optional embodiment, the first control loop and the second control loop share a bridge arm.

[0053] Optionally, the first control loop and the second control loop may share a bridge arm. Figure 2 As shown, the structure where the two control loops corresponding to the power line pair 12 and 36 share the resistor R17 is used as a bridge arm, while the structure where the two control loops corresponding to the power line pair 45 and 78 share the resistor R18 is used as a bridge arm. The design of the shared bridge arm can reduce the number of components required, thereby saving space, which is particularly important for compact design in high-power PoE applications.

[0054] As an optional embodiment, the first control loop and the second control loop each correspond to a bridge arm.

[0055] Optionally, the first control loop and the second control loop may each correspond to a bridge arm. Figure 4 is a topological structure diagram of an optional four-arm rectifier bridge circuit according to an embodiment of the present invention, such as Figure 4 As shown, the middle bridge arm is divided into four groups. The two control loops corresponding to the power line pairs 12 and 36 use the structures where resistors R17 and R19 are located as bridge arms, while the two control loops corresponding to the power line pairs 45 and 78 use the structures where resistors R18 and R20 are located as bridge arms. The basic control logic of the circuit does not change. The design that the first control loop and the second control loop each correspond to a bridge arm can effectively enhance the electrical isolation between the line pairs, optimize the energy conversion efficiency and heat dissipation management, simplify troubleshooting and maintenance, and improve the flexibility and scalability of the system. It is suitable for scenarios with high compatibility requirements, such as medical equipment, aerospace equipment, etc.

[0056] As an optional embodiment, in the case where the multiple groups of power supply line pairs are two groups of power supply line pairs, wherein: when the power of the input rectifier bridge circuit is lower than the preset power threshold, any one group of the two power supply line pairs provides power; when the power of the input rectifier bridge circuit is higher than the preset power threshold, both groups of the power supply line pairs provide power.

[0057] Optionally, when the power of the input rectifier bridge circuit is lower than the preset power threshold, one set of power line pairs supplies power while the other set remains in standby mode, which can reduce energy loss and heat generation during power conversion; when the power of the input rectifier bridge circuit is higher than the preset power threshold, both sets of power line pairs are activated and supply power together, which can meet the power supply needs of high-power equipment. At the same time, by dispersing the power supply load, the burden of a single MOS tube is reduced, heat dissipation is further optimized, component loss is reduced, and good conversion efficiency and system stability are ensured in high-power scenarios. For example, Figure 2 As shown in the figure, when the power supply is AF or AT (low power), power is only supplied to the two pairs of wires 12 and 36, and the two pairs of wires 45 and 78 are not supplied. When the power supply is BT 60W or BT 90W (high power), power is supplied to the four pairs of wires 12, 36, 45 and 78.

[0058] When the rectifier bridge circuit includes multiple power lines, the PSE device can increase or decrease the number of lines involved in power supply according to the feedback information of the PD device. Under low power demand, using only one line pair for power supply reduces the loss of power conversion and reduces heat generation; under high power demand, using multiple lines for power supply according to the needs of the PD device improves the heat dissipation performance of the system by dispersing heat and reducing the heat load of a single MOS tube, ensuring the stable operation of the rectifier bridge circuit in high-power power supply scenarios. It not only improves the flexibility of PoE power supply, but also ensures the efficient use of electricity, avoiding the waste of resources or the inability of equipment to meet demand due to fixed power supply mode.

[0059] According to an embodiment of the present invention, a power supply method embodiment based on the above-mentioned rectifier bridge circuit is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0060] As an optional embodiment, the execution subject of the method of this embodiment may be a power supply system in a PSE device. The power supply system may include a detection module, a classification module, and a power supply module. The detection module is used to identify whether the connected PD device supports PoE power supply. The classification module continues to detect the power demand of the PD device based on the detected results. The power demand divides the PD device into different power levels to determine the power supply strategy. The power supply module is responsible for transmitting appropriate power to the PD device through the power line pair of the Ethernet cable.

[0061] When the PSE device transmits power through the Ethernet cable, the power supply system will communicate with the PD device to identify its power requirements and the configuration of the power line pair. The power supply system in the PSE device will select the appropriate power line pair and power level for power supply based on the feedback information of the PD device, while ensuring that the power supply process complies with the PoE standard, avoiding power supply failures caused by improper power line pair configuration or compatibility issues.

[0062] Figure 5 is a flow chart of a power supply method according to an embodiment of the present invention. Figure 5 As shown, the method comprises the following steps:

[0063] Step S501: Based on the power supply current input by the external power source, the powered device is detected to obtain a detection result.

[0064] In this step, the execution subject may be the power supply system in the PSE device. The PoE power supply process first needs to go through the detection phase and the classification phase to detect the device.

[0065] First, the detection phase is carried out. Specifically, based on the power supply current, a low-level DC current (about a few mA to tens of mA) can be sent to the connected PD device to detect whether the PD device complies with the PoE standard, that is, whether the PD device has the PoE power receiving function. Then, after detecting the current applied by the PSE, the PD device will respond through the internal circuit. The PD device will exhibit a specific impedance, usually a resistance value between 24kΩ and 50kΩ, to indicate that it is a PoE compatible device. Through the detection phase, it can be ensured that only devices that support PoE are powered, avoiding power waste and potential damage to non-PoE devices.

[0066] For example, Figure 2 As shown, assuming that the supply polarity is, line pair 12 is negative and line pair 36 is positive. There are two detection current paths. One path passes through the rectifier bridge arm, from port MDI_36 -> D2 -> ZD2 -> R2 -> R17 -> R5 -> ZD5 -> D5 -> MDI_12. At this time, the transistors Q10 and Q13 The voltage is less than its turn-on voltage , Q10 and Q13 are both in the cut-off region, so MOS tubes Q2 and Q5 are also in the cut-off region; the other path passes through the PD load (such as the PD chip), from port MDI_36 -> Q2's body diode -> PoE+ -> PD chip -> PoE- -> Q5's body diode -> MDI_12. R2, R17, and R5 have large resistance values, much larger than the detection resistor, and are basically equal to the detection resistor after being connected in parallel with the detection resistor, which will not affect the PSE's detection and identification of the PD load.

[0067] Then the classification stage is carried out. Specifically, after detecting that the PD device supports PoE power supply, the actual power demand of the PD device can be further evaluated. Usually, a small current can be sent and the response of the PD device can be monitored. Based on the change in the resistance value of the PD device, the PSE can determine which power level the PD device belongs to, including af, at and bt. The above levels represent the power categories under different standards.

[0068] For example, Figure 2 As shown, assuming that the supply polarity is, line pair 12 is negative and line pair 36 is positive. There are two grading current paths. One path passes through the rectifier bridge arm, from port MDI_36 -> D2 -> ZD2 -> R2 -> R17 -> R5 -> ZD5 -> D5 -> MDI_12. At this time, the transistors Q10 and Q13 The voltage is less than its turn-on voltage , Q10 and Q13 are both in the cut-off region, so MOS tubes Q2 and Q5 are also in the cut-off region; the other path passes through the PD load (such as the PD chip), from port MDI_36 -> Q2's body diode -> PoE+ -> PD chip -> PoE- -> Q5's body diode -> MDI_12. R2, R17, and R5 have large resistance values, and the classification current generated on them is negligible compared to the classification current generated by the PD chip, and will not affect the PSE's recognition of the power classification results of the PD.

[0069] Step S502: Determine the power supply of the powered device based on the detection result.

[0070] In this step, after POE completes the first two stages of the power supply process, namely the detection stage and the classification stage, the power level required by the powered device can be obtained, and the power supply power output of the system target is determined according to the above power level. For example, the power levels may include AF, AT and BT, among which the power supply power corresponding to the BT level is the largest.

[0071] Step S503: Controlling multiple power line pairs to supply power to the powered device according to the relationship between the power supply power and the preset power threshold.

[0072] In this step, the third stage of the POE power supply process is the power-on stage. When the power supply power is lower than the preset power threshold, that is, when the power supply power is AF / AT, power will only be supplied to one group of power supply line pairs, and the polarity is not limited; when the power supply power is higher than the preset power threshold, that is, when the power supply power is BT, power can be supplied to multiple groups of power supply line pairs. Among them, the preset power threshold is determined according to the existing protocol standard, and is used to determine whether the power supply power is the lower AF and AT or the higher BT. The AF and AT power levels refer to the power supply capabilities defined under the IEEE 802.3af and IEEE 802.3at standards. The power supply capacity defined by the AF standard is a maximum of 15.4W, and the AT standard increases the maximum power supply capacity to more than 30W. Under AF or AT power, the configuration and use of the power supply line pairs may be relatively simple, and only one group of power supply line pairs needs to be activated for power supply. The BT power level refers to the power supply capacity defined under the IEEE 802.3bt standard. The BT standard increases the maximum power of PoE power supply to 90W, which far exceeds the power supply capacity of IEEE 802.3af and IEEE 802.3at. In BT mode, PSE can provide up to 90W of power to the PD load, providing sufficient power support for the operation of high-power PD devices.

[0073] For example, Figure 2 As shown, when the power supply is AF / AT, only the two pairs of wires 12 and 36 will be powered; when the power supply is BT, four pairs of wires 12, 36, 45 and 78 will be powered, with 12 and 36 as one group and 45 and 78 as another group. The power-on behavior between the two groups of wire pairs can be divided into synchronous power-on and follow-up power-on according to the power-on sequence, that is, whether there is a sequence in the power-on phase of the 12 and 36 pairs and the 45 and 78 pairs, and the detection and classification process remains unchanged, and will only be performed on the 12 and 36 pairs or the 45 and 78 pairs. Compared with the traditional strategy of directly using all power supply wire pairs, the present invention can reduce energy loss and heat generation in low-power scenarios while meeting the power requirements of PD devices by dynamically controlling the activation state of the power supply wire pairs, thereby improving the overall energy efficiency of the PoE system.

[0074] Through the above steps, the purpose of stable and reliable power-on of the rectifier bridge circuit is achieved, thereby achieving the technical effect of improving the stability and reliability of the rectifier bridge circuit and enhancing the user experience, and further solving the technical problem of the inability to power on in the current rectifier bridge circuit due to the control loop coupling of the power supply line pair.

[0075] As an optional embodiment, when the power supply power is higher than a preset power threshold, multiple power line pairs are controlled to supply power to the powered device, including: obtaining the power supply sequence of the multiple power line pairs; based on the power supply sequence, controlling the power supply circuits corresponding to the multiple power line pairs in turn to be turned on to supply power to the powered device; or, based on the power supply current, controlling the power supply circuits corresponding to the multiple power line pairs to be turned on at the same time to supply power to the powered device.

[0076] Optionally, for the process of following the power-on behavior, when the detection and classification stages are at the same af / at, in the power-on stage, based on the information fed back by the PD device to the PSE device, it can be determined which group of wire pairs are powered first and which group are powered later, so as to adapt to the sensitivity of different PD devices to the power-on sequence. After obtaining the power supply sequence, the power supply circuits corresponding to the multiple groups of power supply wire pairs are controlled to be turned on in sequence based on the sequence to power the powered device, thereby ensuring the continuity of power supply and the smooth startup of the PD device.

[0077] For example, Figure 2 As shown, assuming that the power supply polarity of the two groups of line pairs is that the line pairs 12 and 78 are negative, and the line pairs 36 and 45 are positive, assuming that 45 and 78 are powered on first, and then 12 and 36 are powered on. After 45 and 78 are powered on first, the PoE+ is already a positive voltage. Since the upper bridge arm and the lower bridge arm of the line pairs 12 and 36 and 45 and 78 are connected through resistors R17 and R18 respectively, they are independent of each other, that is, the control loop corresponding to the line pairs 45 and 78 that have been turned on will not affect the control loop of the line pairs 12 and 36 that have not been turned on, so it will not cause the abnormal opening of the external MOS tube Q1 as expected, and the two loops can be independently controlled to complete the power-on process.

[0078] Optionally, for synchronous power-on behavior, the process of af / at in the detection and classification phases, the power supply circuits of all power supply lines are activated simultaneously during the power-on phase, rather than in a specific order. Under BT power supply, synchronous power-on can ensure that all available power supply lines work at the same time, maximizing the efficiency of power supply. Compared with the strategy of following power-on, synchronous power-on reduces the waiting time of PD devices and ensures that high power requirements can be met immediately.

[0079] For example, Figure 2As shown, assuming that the power supply polarity is that the line pairs 12 and 78 are negative, and the line pairs 36 and 45 are positive, the power-on process is that the line pairs 12 and 36 and the line pairs 45 and 78 are powered at the same time, and the control loop path passes through the rectifier bridge arm and is divided into slave port MDI_36-->D2-->ZD2-->R2-->R17-->R5-->ZD5-->D5-->MDI_12 and slave port MDI_45-->D3-->ZD3-->R3-->R18-->R8-->ZD8-->D8-->MDI_78. As the voltages of MDI_36 and MDI_45 increase, the transistors Q10, Q13, Q11, and Q16 change from the cutoff area to the saturation area, and the MOS tubes Q2, Q5, Q3, and Q8 also change from the cutoff area to the variable resistance area. The power supply loop path is slave port MDI_36-->Q2-->PoE+--> PD chip -> PoE- -> Q5 -> MDI_12 and slave port MDI_45 -> Q3 -> PoE+ -> PD chip -> PoE- -> Q8 -> MDI_78, the two circuits are independently controlled to complete the power-on process.

[0080] As an optional embodiment, when the power supply power is lower than a preset power threshold, controlling multiple power line pairs to supply power to the powered device includes: controlling any one of the multiple power line pairs to supply power to the powered device.

[0081] Optionally, when the power supply power is lower than the preset power threshold, that is, when the power supply power is AF / AT, only one set of power line pairs can be activated to power the powered device. The system selects a more economical and effective power supply strategy when the power demand is low, without fully activating all power line pairs, which can optimize resource utilization and reduce energy waste.

[0082] For example, Figure 2 As shown, when the power supply is af / at, it is assumed that only the two pairs of lines 12 and 36 are powered, and the power supply polarity is, line pair 12 is negative, and line pair 36 is positive. There are two paths in the power-on stage, which can be divided into a control loop and a power supply loop. The control loop path passes through the rectifier bridge arm, from port MDI_36 -> D2 -> ZD2 -> R2 -> R17 -> R5 -> ZD5 -> D5 -> MDI_12. As the voltage of MDI_36 increases, transistors Q10 and Q13 will change from the cut-off area to the saturation area, and MOS tubes Q2 and Q5 will also change from the cut-off area to the variable resistance area. At this time, the power supply loop path is from port MDI_36 -> Q2 -> PoE+ -> PD chip -> PoE- -> Q5 -> MDI_12. Since the MOS tube is in a fully turned-on state at this time, the loss generated in its power supply loop is less and the heat is also less.

[0083] According to an embodiment of the present invention, a power supply device is provided. Figure 6 is a structural block diagram of a power supply device according to an embodiment of the present invention. Figure 6 As shown, the power supply device includes: a detection module 61, a determination module 62 and a power supply module 63. The power supply device is described below.

[0084] The detection module 61 is used for detecting the power supply current input by the power supply, detecting the powered device, and obtaining the detection result.

[0085] The determination module 62 is connected to the detection module 61 and is used to determine the power supply of the powered device based on the detection result.

[0086] The power supply module 63 is connected to the determination module 62 and is used to control multiple power supply line pairs to supply power to the powered device according to the relationship between the power supply power and the preset power threshold.

[0087] According to an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium including a stored executable program, wherein when the executable program runs, the device where the computer-readable storage medium is located is controlled to execute any one of the above power supply methods.

[0088] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: based on the power supply current input by the external power supply, detecting the powered device to obtain a detection result; based on the detection result, determining the power supply power of the powered device; and according to the relationship between the power supply power and a preset power threshold, controlling multiple groups of power supply line pairs to supply power to the powered device.

[0089] According to an embodiment of the present invention, an electronic device is provided, comprising: a memory storing an executable program; and a processor for running the program, wherein any one of the above power supply methods is executed when the program is running.

[0090] Optionally, the processor can call the information and application stored in the memory through the transmission device to perform the following steps: based on the power supply current input by the external power supply, detect the powered device to obtain the detection result; based on the detection result, determine the power supply power of the powered device; according to the relationship between the power supply power and the preset power threshold, control multiple groups of power supply line pairs to power the powered device.

[0091] According to an embodiment of the present invention, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps of any one of the above power supply methods are implemented.

[0092] Optionally, in this embodiment, when the computer program is executed by the processor, it can achieve: based on the power supply current input by the external power supply, the powered device is detected to obtain a detection result; based on the detection result, the power supply power of the powered device is determined; according to the relationship between the power supply power and a preset power threshold, multiple groups of power supply line pairs are controlled to supply power to the powered device.

[0093] According to an embodiment of the present invention, a PSE power supply device is provided, comprising a power supply and the above-mentioned rectifier bridge circuit. The PSE power supply device applies the above-mentioned rectifier bridge circuit when supplying power to a powered device.

[0094] Optionally, the PSE device includes a power module and a rectifier bridge circuit for managing the transmission and distribution of power. The power module is responsible for obtaining power from the external power grid and regulating it to an appropriate voltage and current to meet the requirements of the PoE standard. The rectifier bridge circuit is located at the output end of the PSE device and is used to unify the DC voltages of different polarities that may correspond to the access line pairs into a DC voltage of a certain polarity.

[0095] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0096] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0098] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0099] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0100] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0101] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rectifier bridge circuit, characterized in that: include: Multiple power line pairs, among which: The plurality of power supply line pairs are all connected to their respective corresponding control circuits, wherein the control circuits are used to control the power supply status of the power supply circuits corresponding to the corresponding power supply line pairs; A bridge arm is provided in the control loop.

2. The rectifier bridge circuit according to claim 1, characterized in that: The structure of the bridge arm includes at least one of the following: a resistor and a control switch.

3. The rectifier bridge circuit according to claim 1, characterized in that: Each of the plurality of power supply line pairs corresponds to one or more control loops.

4. The rectifier bridge circuit according to claim 3, characterized in that: Any one of the plurality of power line pairs includes a first power line and a second power line, and the control loops corresponding to the plurality of power line pairs include a first control loop and a second control loop, wherein: The first control loop is used to control the corresponding power supply line pair to supply power when a forward current is input into the first power supply line; The second control loop is used to control the corresponding power supply line pair to supply power when a forward current is input to the second power supply line.

5. The rectifier bridge circuit according to claim 4, characterized in that: The first control loop and the second control loop share a bridge arm.

6. The rectifier bridge circuit according to claim 4, characterized in that: The first control loop and the second control loop each correspond to a bridge arm.

7. A power supply method, characterized in that: The rectifier bridge circuit according to any one of claims 1 to 6 supplies power to a powered device, comprising: Based on the power supply current input by the external power supply, the powered device is tested to obtain a test result; Based on the detection result, determining the power supply power of the powered device; According to the magnitude relationship between the power supply power and a preset power threshold, a plurality of power supply line pairs are controlled to supply power to the powered device.

8. The power supply method according to claim 7, characterized in that: When the power supply power is higher than the preset power threshold, controlling the plurality of power supply line pairs to supply power to the powered device includes: Obtaining a power supply sequence of the multiple groups of power line pairs; Based on the power supply sequence, the plurality of power supply lines are controlled in sequence to conduct the power supply circuits corresponding to the respective power supply lines, so as to supply power to the powered device; Alternatively, based on the power supply current, the plurality of power supply lines are controlled to simultaneously conduct the power supply circuits corresponding to the respective power supply lines to supply power to the powered device.

9. The power supply method according to claim 7, characterized in that: When the power supply power is lower than the preset power threshold, controlling the plurality of power supply line pairs to supply power to the powered device includes: Control any one of the plurality of power line pairs to supply power to the powered device.

10. A power supply device, characterized in that: include: A detection module, used to detect the powered device based on the power supply current input by the external power supply to obtain a detection result; A determination module, used to determine the power supply power of the powered device based on the detection result; The power supply module is used to control multiple power supply line pairs to supply power to the powered device according to the relationship between the power supply power and a preset power threshold.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored executable program, wherein when the executable program is executed, the device where the computer-readable storage medium is located is controlled to execute the power supply method according to any one of claims 7 to 9.

12. An electronic device, characterized in that: include: A memory storing an executable program; A processor, configured to run the program, wherein the program, when running, executes the power supply method described in any one of claims 7 to 9.

13. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the power supply method according to any one of claims 7 to 9 are implemented.

14. A PSE power supply device, comprising a power supply and a rectifier bridge circuit according to any one of claims 1 to 6, characterized in that: The PSE power supply equipment applies the rectifier bridge circuit when supplying power to a powered device.

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